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STOCK PLANS (Tables)

9 Months Ended

Sep. 30, 2021

Stockholders' Equity Note [Abstract]

Schedule of recognized stock-based compensation in consolidated statements of operations

The Company recognized stock-based compensation expense in the periods presented as follows (in thousands):

						Three Months Ended September 30,												Nine Months Ended September 30,
						2021						2020						2021						2020
Cost of goods sold						$	1,512					$	1,546					$	4,429					$	4,050
Research and development						1,156						1,401						3,591						3,944
Selling, general and administrative						8,116						8,007						23,336						21,030
Total						$	10,784					$	10,954					$	31,356					$	29,024
Stock-based compensation from:
Stock options						$	6,458					$	7,181					$	19,507					$	19,795
Restricted stock units						4,126						3,552						11,164						8,589
Employee stock purchase plan						200						221						685						640
Total						$	10,784					$	10,954					$	31,356					$	29,024

Schedule of the company's stock option activity and restricted stock unit activity

The following tables contain information about the Company’s stock option and restricted stock unit, or RSU, activity for the nine months ended September 30, 2021:

Stock Options						Number of Options						Weighted Average Exercise Price (Per Share)
Outstanding at December 31, 2020						6,235,118						$	45.98
Granted						769,352						61.33
Exercised						(553,023)						34.43
Forfeited						(238,865)						46.19
Expired						(42,416)						76.62
Outstanding at September 30, 2021						6,170,166						48.71

Restricted Stock Units						Number of Units						Weighted Average Grant Date Fair Value (Per Share)
Unvested at December 31, 2020						957,453						$	46.34
Granted						401,845						61.53
Vested						(302,228)						44.87
Forfeited						(114,562)						49.95
Unvested at September 30, 2021						942,508						52.85

Schedule of share-based payment award, stock options, valuation assumptions

The fair values of stock options granted were estimated using the Black-Scholes option valuation model with the following weighted average assumptions:

Black-Scholes Weighted Average Assumption						Nine Months Ended September 30, 2021
Expected dividend yield						None
Risk-free interest rate						0.82%
Expected volatility						49.26%
Expected term of options						5.42 years

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- Definition

Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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